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Bos M, Riguet E. Synthesis of chiral γ-lactones by one-pot sequential enantioselective organocatalytic michael addition of boronic acids and diastereoselective intramolecular passerini reaction. J Org Chem 2014; 79:10881-9. [PMID: 25365780 DOI: 10.1021/jo501908z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The synthesis of α,γ-substituted chiral γ-lactones was quickly achieved in a one pot sequential process. The procedure involves an enantioselective organocatalysed transfer of boronic acid to 5-hydroxyfuran-2(5H)-one, followed by an intramolecular diastereoselective Passerini-type reaction. The methodology was developed and optimized with N-Boc-indole-2-boronic acid giving access to α-indole-γ-substituted lactones in high yields and good diastereoisomeric and enantiomeric ratios. By applying the process to other boronic acids, the synthesis of structurally diversified α,γ-substituted chiral lactones was also achieved in good yields albeit with lower enantioselectivities.
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Biscans A, Bos M, Martin AR, Ader N, Sczakiel G, Vasseur JJ, Dupouy C, Debart F. Direct synthesis of partially modified 2'-O-pivaloyloxymethyl RNAs by a base-labile protecting group strategy and their potential for prodrug-based gene-silencing applications. Chembiochem 2014; 15:2674-9. [PMID: 25346406 DOI: 10.1002/cbic.201402382] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Indexed: 01/30/2023]
Abstract
An original and straightforward synthesis of partially modified 2'-O-pivaloyloxymethyl-substituted (PivOM-substituted) oligoribonucleotides has been achieved. The aim of this 2'-enzymolabile modification was to enhance nuclease stability of RNA and transmembrane transport. To make these modified RNAs easily available we developed a base-labile protecting group strategy with standard protections for nucleobases (acyl) and phosphates (cyanoethyl), a Q-linker and two different acetalester protection groups for 2'-OH: propionyloxymethyl (PrOM) and PivOM. Interestingly, orthogonal deprotection conditions based on anhydrous butylamine in THF were found to remove propionyloxymethyl groups selectively, while preserving PivOM groups. Duplex stability, circular dichroism studies and nuclease resistance, as well as the ability to inhibit gene expression of modified 2'-O-PivOM RNA, were evaluated.
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Ambagtsheer J, Pascalev A, de Jong J, Lundin S, Ivanovski N, Codreanu N, Gunnarson M, Yankov J, Frunza M, Byström I, Bos M, Weimar W. Trafficking in human beings for the purpose of organ removal: A comprehensive literature review. Transpl Immunol 2014. [DOI: 10.1016/j.trim.2014.11.201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Nogova L, Mattonet C, Scheffler M, Michels S, Bos M, Heukamp L, Schildhaus H, Fuhr U, Eberhardt W, Reis H, Wiesweg M, Schmid K, Schoch G, Serke M, Ko Y, Schuler M, Büttner R, Wolf J. Try - a Phase Ii Study to Evaluate Safety and Efficacy of Combined Trastuzumab and the Hsp90 Inhibitor Auy922 in Advanced Non-Small-Cell Lung Cancer (Nsclc) with Her2 Overexpression or Amplification or Mutation. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu349.17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Pieters B, Bos M, Ordonez-Marmolejo R, Rasch C. PO-1042: Comparison of cystectomy and organ preservative brachytherapy for bladder cancer in a systematic review. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)31160-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Grech A, Bos M, Brodie J, Coles R, Dale A, Gilbert R, Hamann M, Marsh H, Neil K, Pressey RL, Rasheed MA, Sheaves M, Smith A. Guiding principles for the improved governance of port and shipping impacts in the Great Barrier Reef. MARINE POLLUTION BULLETIN 2013; 75:8-20. [PMID: 23932477 DOI: 10.1016/j.marpolbul.2013.07.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 07/04/2013] [Accepted: 07/04/2013] [Indexed: 06/02/2023]
Abstract
The Great Barrier Reef (GBR) region of Queensland, Australia, encompasses a complex and diverse array of tropical marine ecosystems of global significance. The region is also a World Heritage Area and largely within one of the world's best managed marine protected areas. However, a recent World Heritage Committee report drew attention to serious governance problems associated with the management of ports and shipping. We review the impacts of ports and shipping on biodiversity in the GBR, and propose a series of guiding principles to improve the current governance arrangements. Implementing these principles will increase the capacity of decision makers to minimize the impacts of ports and shipping on biodiversity, and will provide certainty and clarity to port operators and developers. A 'business as usual' approach could lead to the GBR's inclusion on the List of World Heritage in Danger in 2014.
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Bos M, Gardizi M, Schildhaus HU, Heukamp LC, Geist T, Kaminsky B, Zander T, Nogova L, Scheffler M, Dietlein M, Kobe C, Holstein A, Maintz D, Büttner R, Wolf J. Complete metabolic response in a patient with repeatedly relapsed non-small cell lung cancer harboring ROS1 gene rearrangement after treatment with crizotinib. Lung Cancer 2013; 81:142-3. [PMID: 23558310 DOI: 10.1016/j.lungcan.2013.02.018] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Accepted: 02/19/2013] [Indexed: 11/30/2022]
Abstract
A 55-year-old Caucasian woman with lung adenocarcinoma stage IV presented with repeated relapse after treatment with cytotoxic chemotherapy (carboplatin, gemcitabine, docetaxel, pemetrexed) and targeted agents (erlotinib, cetuximab, sunitinib). Comprehensive molecular diagnostics (EGFR-, ALK-, RAS-, BRAF-, PIK3CA-, HER2- and DDR2-aberrations) were performed and failed initially to detect any driver mutation. While the patient suffered from rapid deterioration of her general condition, in particular from progressive dyspnea due to lung metastases, we implemented screening for RET- and ROS1 translocations into our molecular diagnostic program based on recent reports of these new molecular subgroups in lung adenocarcinoma. On retesting the patient's tumor sample was found to harbor a ROS1-translocation. The patient was subsequently treated with crizotinib and experienced a pronounced clinical improvement corresponding to a complete metabolic response in (18)F-FDG-PET and a good and confirmed partial response in CT (RECIST 1.1). Our case exemplifies the need for rapid implementation of newly discovered rare genetic lung cancer subtypes in routine molecular diagnostics.
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Bos M, Kool-Goudzwaard N, Gamel CJ, Koekkoek B, van Meijel B. The treatment of 'difficult' patients in a secure unit of a specialized psychiatric hospital: the patient's perspective. J Psychiatr Ment Health Nurs 2012; 19:528-35. [PMID: 22070631 DOI: 10.1111/j.1365-2850.2011.01827.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The aim of this study is to obtain insight, from a patient's perspective, into the results and essential components of treatment in specialist settings for so-called 'difficult' patients in mental health care. In cases where usual hospital treatment is not successful, a temporary transfer to another, specialist hospital may provide a solution. We investigated which aspects of specialist treatment available to 'difficult' patients are perceived as essential by the patients and what are the results of this treatment in their perception. A qualitative research design based on the Grounded Theory method was used. To generate data, 14 semi-structured interviews were held with 12 patients who were admitted to a specialist hospital in the Netherlands. Almost all respondents rated the results of the specialist treatment as positive. The therapeutic climate was perceived as extremely strict, with a strong focus on structure, cooperation and safety. This approach had a stabilizing effect on the patients, even at times when they were not motivated. Most patients developed a motivation for change, marked by a growing and more explicit determination of their future goals. We concluded that a highly structured treatment environment aimed at patient stabilization is helpful to most 'difficult' patients.
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Bontenbal M, Seynaeve C, Stouthard J, Bos M, Braun H, Erdkamp FL, van Deijk G, Schmitz P, Van der Stelt-Frissen I, Hamberg P, Klijn J. Randomized study comparing efficacy/toxicity of monotherapy trastuzumab followed by monotherapy docetaxel at progression, and combination trastuzumab/docetaxel as first-line chemotherapy in HER2-neu positive, metastatic breast cancer (MBC) (HERTAX study). J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.1014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Bos M, Vrielink JM. The influence of scattering processes in quantitative X-ray fluorescence analysis. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.04.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Klerk CPW, Smorenburg S, Otten HM, Richel D, Van Tienhoven G, Lensing A, Büller H, Prandoni P, Bos M, Prins M. Low-molecular-weight heparin and the survival of patients with advanced malignancy. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.8018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Bos M, Braams R, Leenen L. Crit Care 2004; 8:P62. [DOI: 10.1186/cc2529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Bos M, de Bosschere H, Deprez P, van Loon G, de Vriese SR, Christophe AB, Ducatelle R. Chemical identification of the (causative) lipids in a case of exogenous lipoid pneumonia in a horse. Equine Vet J 2002; 34:744-7. [PMID: 12455849 DOI: 10.2746/042516402776250351] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Seger LHGJ, Wouters MEL, Bos M, van den Berg JWA, Vancso GJ. Surface energy characteristics of toner particles by automated inverse gas chromatography. J Chromatogr A 2002; 969:215-27. [PMID: 12385393 DOI: 10.1016/s0021-9673(02)00374-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Inverse gas chromatography (IGC) was applied to the surface energy study of surfaces of toner particles. The dispersive component of the surface energy was determined for three toner materials by infinite dilution IGC. The values obtained were comparable to the values obtained from contact angle experiments. Previous adhesion experiments by atomic force microscopy suggested that the toner is a hydrophilic material with multiple adsorption energy sites. Both aspects were at least qualitatively confirmed by finite concentration IGC. Several indications for surface heterogeneity were found: (i) the difference between the dispersive component of the surface energy determined by IGC and the unexpectedly low total surface energy as determined by droplet analysis, (ii) the strong tailing behavior of the peaks of the injected polar probes, (iii) the decrease of the net retention volume with increasing n-pentane concentration, and finally (iv) the broad energy site distribution function with a dominant site at 28 kJ/mol, as determined by finite concentration IGC for n-pentane as molecular probe.
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Bos M. [Waltham Award for evaluation of laparoscopic ovariectomy in the bitch]. TIJDSCHRIFT VOOR DIERGENEESKUNDE 2002; 127:401-2. [PMID: 12096468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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Bos M, Boukamp B, Vrielink J. Determination of diffusion profiles of silver ions in soda-lime–silica glass by X-ray fluorescence spectrometry. Anal Chim Acta 2002. [DOI: 10.1016/s0003-2670(02)00136-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abstract
The Dutch healthcare system is not a single overall plan, but has evolved from a constantly changing mix of institutions, regulations, and responsibilities. The resulting system provides high-quality care with reasonable efficiency and equal distribution over the population. Every Dutch citizen is entitled to health care. Health insurance is provided by a mix of compulsory national insurance and public and private insurance schemes. Hospitals generally have a private legal basis but are heavily regulated. Supraregional planning of high-tech medical services is also regulated. Hospitals function under fixed, prospective budgets with regulation of capital investments. Independent general practitioners serve a gatekeeper role for specialist and hospital services and are paid by capitation or fee for service. Specialists are paid by fee for service. All physicians' fees are controlled by the Ministry of Economic Affairs. Coverage of benefits is an important method of controlling the cost of services. There is increasing concern about health care quality. Health technology assessment (HTA) has become increasingly visible during the last 15 years. A special national fund for HTA, set up in 1988, has led to many formal and informal changes. HTA has evolved from a research activity into policy research for improving health care on the national level. In 1993 the government stated formally that enhancing effectiveness in health care was one of its prime targets and that HTA would be a prime tool for this purpose. The most important current issue is coordination of HTA activities, which is now undertaken by a new platform representing the important actors in health care and HTA.
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Bos M, Vrielink J, van der Linden W. Non-destructive analysis of small irregularly shaped homogenous samples by X-ray fluorescence spectrometry. Anal Chim Acta 2000. [DOI: 10.1016/s0003-2670(00)00771-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Baselga J, Pfister D, Cooper MR, Cohen R, Burtness B, Bos M, D'Andrea G, Seidman A, Norton L, Gunnett K, Falcey J, Anderson V, Waksal H, Mendelsohn J. Phase I studies of anti-epidermal growth factor receptor chimeric antibody C225 alone and in combination with cisplatin. J Clin Oncol 2000; 18:904-14. [PMID: 10673534 DOI: 10.1200/jco.2000.18.4.904] [Citation(s) in RCA: 500] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PURPOSE The epidermal growth factor (EGF) receptor is frequently overexpressed in epithelial tumors. C225 is a human-to-murine chimeric monoclonal antibody that binds to the receptor and inhibits growth of cancer cells expressing the receptor. We evaluated the pharmacokinetics and toxicity of C225 in patients with advanced tumors overexpressing EGF receptors. PATIENTS AND METHODS We treated 52 patients in three successive phase I clinical trials of C225 as a single dose (n = 13), weekly multiple dose (n = 17), and weekly multiple dose with cisplatin (n = 22). C225 dose levels were 5, 20, 50, and 100 mg/m(2). In the study combining C225 with cisplatin, limited to patients with either head and neck or non-small-cell lung cancer, C225 was further escalated to 200 and 400 mg/m(2). Cisplatin was given at a dose of 60 mg/m(2) once every 4 weeks, and treatment was continued for up to 12 weeks if no disease progression occurred. RESULTS C225 displayed nonlinear pharmacokinetics, with antibody doses in the range of 200 to 400 mg/m(2) being associated with complete saturation of systemic clearance. C225 clearance did not change with repeated administration or with coadministration of cisplatin. Antibodies against C225 were detected in only one patient, and C225-associated toxicity was minimal. Patients experiencing disease stabilization were seen in all studies. In the study combining C225 and cisplatin, nine (69%) of 13 patients treated with antibody doses >/= 50 mg/m(2) completed 12 weeks of therapy, and two partial responses were observed. CONCLUSION C225 has dose-dependent pharmacokinetics, and doses that achieve saturation of systemic clearance are well tolerated. C225 given in combination with cisplatin has biologic activity at pharmacologically relevant doses.
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MESH Headings
- Adult
- Antibodies, Monoclonal/adverse effects
- Antibodies, Monoclonal/pharmacokinetics
- Antibodies, Monoclonal/therapeutic use
- Antibodies, Monoclonal, Humanized
- Antineoplastic Agents/adverse effects
- Antineoplastic Agents/pharmacokinetics
- Antineoplastic Agents/therapeutic use
- Area Under Curve
- Carcinoma, Non-Small-Cell Lung/drug therapy
- Carcinoma, Non-Small-Cell Lung/therapy
- Carcinoma, Squamous Cell/drug therapy
- Carcinoma, Squamous Cell/therapy
- Cetuximab
- Cisplatin/therapeutic use
- Dose-Response Relationship, Drug
- Drug Administration Schedule
- ErbB Receptors/antagonists & inhibitors
- ErbB Receptors/genetics
- Female
- Gene Expression Regulation, Neoplastic
- Head and Neck Neoplasms/drug therapy
- Head and Neck Neoplasms/therapy
- Humans
- Infusions, Intravenous
- Lung Neoplasms/drug therapy
- Lung Neoplasms/therapy
- Male
- Neoplasms, Glandular and Epithelial/drug therapy
- Neoplasms, Glandular and Epithelial/therapy
- Recombinant Fusion Proteins/adverse effects
- Recombinant Fusion Proteins/pharmacokinetics
- Recombinant Fusion Proteins/therapeutic use
- Remission Induction
- Safety
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Peters HP, Bos M, Seebregts L, Akkermans LM, van Berge Henegouwen GP, Bol E, Mosterd WL, de Vries WR. Gastrointestinal symptoms in long-distance runners, cyclists, and triathletes: prevalence, medication, and etiology. Am J Gastroenterol 1999; 94:1570-81. [PMID: 10364027 DOI: 10.1111/j.1572-0241.1999.01147.x] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE The aim of this study was to determine the prevalence of exercise-related gastrointestinal (GI) symptoms and the use of medication for these symptoms among long-distance runners, cyclists, and triathletes, and to determine the relationship of different variables to GI symptoms. METHODS A mail questionnaire covering the preceding 12 months was sent to 606 well-trained endurance type athletes: 199 runners (114 men and 85 women), 197 cyclists (98 men and 99 women), and 210 triathletes (110 men and 100 women) and sent back by 93%, 88%, and 71% of these groups, respectively. Symptoms were evaluated with respect to the upper (nausea, vomiting, belching, heartburn, chest pain) or lower part of the GI tract (bloating, GI cramps, side ache, urge to defecate, defecation, diarrhea). For statistical analysis, Mann-Whitney U test, Fisher exact test, or Student t test were used. RESULTS Runners experienced more lower (prevalence 71%) than upper (36%) GI symptoms during exercise. Cyclists experienced both upper (67%) and lower (64%) symptoms. Triathletes experienced during cycling both upper (52%) and lower (45%) symptoms, and during running more lower (79%) than upper (54%) symptoms. Bloating, diarrhea, and flatulence occurred more at rest than during exercise among all subjects. In general, exercise-related GI symptoms were significantly related to the occurrence of GI symptoms during nonexercise periods, age, gender, diet, and years of training. The prevalence of medication for exercise-related GI symptoms was 5%, 6%, and 3% for runners, cyclists, and triathletes, respectively. CONCLUSIONS Long-distance running is mainly associated with lower GI symptoms, whereas cycling is associated with both upper and lower symptoms. Triathletes confirm this pattern during cycling and running. The prevalence of medication for exercise-related GI symptoms is lower in the Netherlands in comparison with other countries, in which a prevalence of 10-18% was reported. More research on the possible predisposition of athletes for GI symptoms during exercise is needed.
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van Akker E, Bos M, van der Linden W. Continuous, pulsed and stopped flow in a μ-flow injection system (numerical vs experimental). Anal Chim Acta 1999. [DOI: 10.1016/s0003-2670(98)00606-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bos M, Bonke B. When seemingly irrelevant details matter: hidden covariation detection reexamined. Conscious Cogn 1998; 7:596-602. [PMID: 9817815 DOI: 10.1006/ccog.1997.0328] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hidden covariation detection (HCD) theory states that when personality characteristics are surreptitiously associated with irrelevant features, these features obtain heuristic value for future evaluations of personality characteristics. According to the theory, subjects are not consciously aware of using such heuristics in their evaluations. We tested these hypotheses by confronting participants with statements that were said to belong to separate individuals, in which the apparent level of intelligence was associated with an irrelevant feature of the person who allegedly made these statements. In line with HCD theory, participants appeared to use this association, unconsciously, to guide their subsequent evaluations. Implications of these findings for HCD theory are discussed.
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Bos M, Vrielink J. Constraints, iteration schemes and convergence criteria for concentration calculations in X-ray fluorescence spectrometry with the use of fundamental parameter methods. Anal Chim Acta 1998. [DOI: 10.1016/s0003-2670(98)00412-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Bos M, Lusskin R. Acute disruption of the posterior tibial tendon associated with open-fracture dislocation of the ankle. Foot Ankle Int 1997; 18:823-6. [PMID: 9429887 DOI: 10.1177/107110079701801213] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A 27-year-old man with a high-energy, open-fracture dislocation of the ankle underwent debridement and open reduction of his injuries. During surgery a disruption-laceration of the posterior tibial tendon at the level of the fracture of the medial malleolus was found. Repair required location of the proximal muscle and tendon and controlled traction of the musculotendinous unit from its retracted position. Common aspects in the nine previously reported instances of this lesion include relatively high energy of the injury and the fracture type, a transverse fracture in the medial malleolus. Unique to this case was the open injury.
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Bos M, Mendelsohn J, Kim YM, Albanell J, Fry DW, Baselga J. PD153035, a tyrosine kinase inhibitor, prevents epidermal growth factor receptor activation and inhibits growth of cancer cells in a receptor number-dependent manner. Clin Cancer Res 1997; 3:2099-106. [PMID: 9815602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
PD153035 is reported to be a specific and potent inhibitor of the epidermal growth factor (EGF) receptor tyrosine kinase and, to a lesser degree, of the closely related HER2/neu receptor. We show that PD153035 inhibits EGF-dependent EGF receptor phosphorylation and suppresses the proliferation and clonogenicity of a wide panel of EGF receptor-overexpressing human cancer cell lines. EGF receptor autophosphorylation in response to exogenous EGF was completely inhibited at PD153035 concentrations of >75 nM in cells overexpressing the EGF receptor. In contrast, PD153035 only reduced heregulin-dependent tyrosine phosphorylation in HER2/neu-overexpressing cell lines at significantly higher concentrations (1400-2800 nM). PD153035 exposure did not affect the expression of either EGF receptors or HER2/neu. PD153035 caused a dose-dependent growth inhibition of EGF receptor-overexpressing cell lines at low micromolar concentrations, and the IC50 in monolayer cultures was less than 1 microM in most cell lines tested. At doses of up to 2.5 microM, the IC50 for HER2/neu-overexpressing cells was not reached. In colony-forming assays, the PD153035 growth-inhibitory activity in cultures driven by endogenous (autocrine) ligand was correlated with EGF receptor number, with higher activity in cells expressing higher numbers of EGF receptors and only minimal activity in cells expressing normal numbers of EGF receptors but high HER2/neu levels. PD153053 also abolished all growth effects mediated by the addition of exogenous EGF; this condition could be reversed upon removal of the compound. Cotreatment with C225, an anti-EGF receptor-blocking monoclonal antibody, further enhanced the antitumor activity of PD153035, suggesting mechanisms of action for C225 other than competition with ligand binding. This latter finding also suggests that combined anti-EGF receptor strategies may be of enhanced benefit against tumors with high levels of EGF receptor expression.
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